bill whittaker is inside the stadium. i know the weather is very dreary. a friend says, that's why we have umbrellas, nobody seems to mind this very drizzly weather there today. hello, bill whittaker. >> the president is making his way under the umbrella as he makes hi way. >> reporter: you see president obama making his way to the stage now. it is one of the highlights, if not the highlight, of this day. people have been waiting to hear president obama's speech. as he said earlier, when he came in, the crowd went wild cheering. now, the moment has come. he is greeting all of the other dignitaries, ban ki-moon. obama has said that nelson mandela was one of his heroes. i think it is fair to say that president obama is a hero to many of the south africans. they see in him something like some of what nelson mandela was like. a nation as large and powerful as the united states is. they see that in president obama. >> president obama is shaking many of these world leaders and dignitaries and shaking the hand of raul castro and others. >> on sunday, when we were